| 摘要 |
A highly reliable ESD protection device which can precisely set discharge start voltage is provided. The ESD protection device (10) is provided with (a) a ceramic multilayer substrate (12), (b) a hollow part (13) formed inside the ceramic multilayer substrate (12), (c) at least a pair of discharge electrodes (16) and (18) having confronted parts (17) and (19) arranged in the hollow part (13) by providing a space so that tips (17k) and (19k) are confronted each other, and (d) outer electrodes (22) and (24) which are formed on a surface of the ceramic multilayer substrate (12) and are connected to the discharge electrodes (16) and (18). The ceramic multilayer substrate (12) is also provided with a mixing part (14) arranged near the surface where the discharge electrodes (16) and (18) are installed and arranged adjacently to the confronted parts (17) and (19) of the discharge electrodes (16) and (18) and a part (15) between the confronted parts (17) and (19). The mixing part (14) comprises metal materials (14k) and a ceramic material.
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